class_docstr: A structure to store batch timestamp.
code: def __repr__(self):
      return "'BatchTimestamp<batch_index: {}, timestamp: {}>'".format(
          self.batch_index, self.timestamp
      )
  
imports: import datetime
  import os
  import time
  from typing import Dict, Optional, Tuple
  from absl import logging
  import numpy
  from six.moves import range
  from six.moves import zip
  import tensorflow
  from tensorflow.core.util import event_pb2
  from tensorflow.python.lib.io import tf_record
label_desc: Use image node_id 2 for calling the BatchTimestamp obj's underlying member method code with example usage: obj.__repr__() and returns: str